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ELECTRIC WIRE. No. 284,959. Patented Sept. 11, 1883.

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UNITED STATES PATENT OFFICE.

'YVILLIAM HALKYARD, OF PROVIDENCE, RIIODE ISLAND, ASSIGNOR OF ON E HALF TO HENRY A. CHURCH, OF SAME PLAO11- ELECTRIC WIRE.

SPECIFICATION forming part of Letters Patent No. 284,959,

dated September 11, 1883.

Application filed April 7, 1853. (No model.)

To CLZZ whom it may concern.-

Be it known that I, \VILLIAM HALKYARD, of the city and county of Providence,and State of Rhode Island, have invented a new and useful Improvement in ElectricXVires; and I hercby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming part of this specification.

This invention has reference to an improvement in insulated wire for electrical purposes, in which the insulating material is protected by 3111161381 armor; and it consists in the peeuliar and novel construction of the armor, by which a strip of metal wider than the insir lated wire or cable is placed around the same, so as to lap, having alongitudinal seam lengthwise with the wire, as will be more fully set forth hereinafter.

Figure l is a perspective view of an insulated wire covered with a sheet-metal casing or armor. Fig. 2 is a perspective view of a number of insulated wires formed into a cable protected by a sheetanetal armor. Fig. 3 is a sectional view of an insulated wire and a sheet-metal strip partly bent around the same. Fig. 4 is a sectional view of an insulated wire partly inclosed in a sheet-nietal armor, and Fig. 5 is a sectional view of an insulated wire protected by a sheetanetal armor.

The invention relates to an electric wire having a protecting armor or covering, which is made from a strip or ribbon of 1netal,extending lengthwise of the wire and having the edges of said ribbon lapped.

In the drawings, A is an electric wire. B is an insulating-coverin C is the metal. strip, made wider than the circumference of the insulated wire, so as to form the lap I). The sheet 0 is formed into a trough, in which the wire is placed, as is shown in Fig. One side of the sheet is now placed around the wire, as is shown in Fig. 4, when the other side of the sheet is formed over the same, as shown in Fig. 5, making the lap D, inclosing the whole wire and protecting the insulating material, at the same time adding the tensile strength of the sheet covering to the tensile strength of the wire. I prefer to secure the lapped edge with solder, as this firmly secures the same and allows the so-shceted wire to be bent freely without opening the lapped scam. It will be readily understood that the sheet C and lap D are 011 a line with the axis of the wire, and particularly, when soldered, does the lap materially increase the tensile strength of the compound wire, so that a very light wire of high conductive power may be used for the central wire, and the sheeting made of a metal of considerable tensile strength, depending on its strength mainly for supporting the wire, while the reverse may also be done by using a strong wire and a light sheet-metal casing. .Vhere the covering 0 is lapped-that is, where one edge of said covering extends past the other-the interior layer of the lapped portion is olt'set or sunk into the insulating material, so that the external portion of the completed wire is smooth or circular.

Electric wires may be thus covered in a simple machine at considerable speed and at small cost. One method for so covering the wire I have described in the Patent No. 253,529, granted February 1-1, 1882, and to which reference is made; but other means and methods maybe used to so cover the insulated wire,one of which is described in an application for a patent filed of even date with this application.

lVhen a cable is to be protected by a sheet metal armor, I group the wires into nearly a circle and cover the whole with the insulating material Z), so as to term a cylinder, and around this I place the sheet, lapping the same at one side and preferably securing the lapped edge with solder.

By reason of the offsetin the covering-strip, into which offset the external lapped edge extends, the surface of the wire is cylindrical, and the edge of the covering-strip is protected from catching when the wire is drawn over a bracket. The wire also presents a more linished appearance.

By reason of the lap, especially when the lap is soldered, a very considerable strength and rigidity is given to the wire.

I do not claim,broadly,all forms of insulated wire covered by a ribbon of metal. ires resembling mine in many respects are shown in 2 I 284.959 p A English Patents N0. 9060i 1853 and in No. sisting of a number of wires insulated from 778 of 1852. Iclaim only as hereinafterstated. each other, a layer of insulating. material, and

Having thus describedmyinvention,Iclaim l a metallic covering consisting of a sheet of I 5 as new and desire to secure by Letters Patentmetal having its edges lapped and soldered,as 5 1. The improved electric Wire or cable condescribed, and having the lapped portion 011"- sisting of a number of insulated wires, a layer set, so that the exterior of the covering shall of insulating material surrounding the same, be cylindrical,- substantially as shown and set and the external covering of sheet metal, the forth. p h p edges of said sheet metal being lapped and sol- WILLIAM HALKYARD. IO dered and the lap-joint extending longitudi- Witnesses: v

nally of the wire or cable, as set forth. i M. F. BLIGH,

2. The improved electric Wire or cable con- J. A. MILLER, Jr. 

